Improved machine for bending rake-teeth



O. COLEMAN.

MACHINE FOR BENDING RAKE TEETH.

No. 99,638. Patnted Feb. 8, 1870.

tion and operation.

tinned fitmefittest Gtjiliirr,

Letters Patent No. 99,638, dated February 8, 187 0.

IMPROVED MACHINE m- :emvmne RAKE-TEETH.

I The Schedule referred to these Letters Patent and making part of the same To all whom it mag concern.-

Be it known that I, CoLUMBos COLEMAN, of the city and county of Allegheny, and'State of Pennsylvania, have invented a new and useful Improvement in Machines for Bending Rake-Teeth; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the ac companying drawings, and to the letters-of reference marked thereon.

The nature of. my invention consists in the construe tion, combination, and arrangement of the parts hereinafter described, said parts operating, with relation to each other, in the manner and for the purpose set forth. p r

To enable others skilled in the art to make and use my invention, 1 will proceed to describe its construc- In the accompanying drawings, which form part of this specification Figures 1 and 2 are front elevations of my improved machine for bending rake-teeth, representing these-veral parts in different positions.

Figure 3 is a side elevation of the same.

Figures 4, .5, and 6, are side views of the headinglever, showing it in different positions during the operation of forming the spring on the rake-tooth.

Figure 7 is a side view of the rake-tooth formed on my improved bending-machine. i

In the accompanying drawings- A represents the frame of the machine, which is constructed of iron.

In the frame A is placed a sliding-head, B, to the arm 0 of which is pivoted a grooved roller, f.

Above the sliding-head B is placed a spring, '0, which, pressingdown on it, presses the groo'ved roller f down on the .edge of the detachable form 2:, which is secured to the disk Dby means of bolts.

The disk Dis pivoted to the frame A, and is provided'with slots or openings 0, for tlhe bolts used for holding the form a; and guide It to the face of the disk.

To the disk is secured a yoke, g, for" holding the heading-lever in position. The inner end of the lever is fitted to an opening in the disk.

The inner end of the heading-lever is provided with a slot, 0', as shown in fig. 4.

As the construction and arrangement of the several parts of the machine will be readily understood fromthe foregoing description and by reference to the drawings, I wilitherefore proceed to describe the operation.

The rods of iron or steel for forming-the rake-teeth are heated, by means of a suit-able furnace, to the required degree for bending.

The operator then places the heated rod for forming the tooth in between the grooved roller f andforrn x,'passing it through the slot 0' in the heading-lever J, so that it will project pastor through the lever, as indicated by the dotted lines y, in'fig. 1, or\as shown in fig. 5.

He then turns the lever so as to form one or more coils of the spring. He then turns the disk, as indicated by the arrow in fig. 1, and the roller j, pressing downthe rod, will bend it to the form a, giving to the tooth a curvature, as shown at i in fig. 7

Soon as the rod g has passed from under the rolle i f, he draws back or out the heading-lever J, so that The disk is then turned back, as indicated by the arrow in'fig. 2, until the disk,-and the parts attached to it, are in the position shown in fig. 1. a

The guide I is used for preventing the grooved roller f from dropping down past the end of the form x. The position of the guide may be changed to correspond to any change of the form, or of its position on the disk.

Teeth of any desired curvature may be formed by simply changing the form at on the disk D, and all the different forms of the coil-spring s, on rake-teeth, may

operatingwith relation to each other,- substantially as herein described, and for the purpose set forth.

V COLUMBUS GOLEMAN.

Witnesses: p

A. O. JouNsToN, .JAS. G. THoMPsoN. 

